Many games can be very socialiable, either playing against your mates on the sofa or online with other people Many other games are aimed for single player and so could be criticised for isolating you from family and friends for many hours
Games can be intellectual where you use clever strategy to beat other people. They can take an awful lot of hours, that time could be spent doing something more productive or sociable
Games can be educational such as simulations of flight or real-life situations Constant use of thumbs, wrist and eyes can lead to problems such as eye strain, RSI and other physical problems
Improved eye-hand co-ordination for playing those fast action games Games do not need much physical activity and so could be criticised for making you unfit - although the new motion sensing games are extremely active!
Improved reaction times and quick thinking as a result of playing challenging games The hardware and software together are quite expensive, which can be a challenge when balancing what you want to spend your money on.
Games are plain fun!